mybatis详解-(23)spring整合
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Spring是一个开放源代码的设计层面框架，他解决的是业务逻辑层和其他各层的松耦合问题，因此它将面向接口的编程思想贯穿整个系统应用。Spring是于2003 年兴起的一个轻量级的Java 开发框架，由Rod Johnson创建。简单来说，Spring是一个分层的JavaSE/EEfull-stack(一站式) 轻量级开源框架。
本篇还是以示例的形式介绍一下spring是如何整合mybatis。
1.使用maven构建web项目
pom.xml文件配置
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.mybatis</groupId> <artifactId>mybatis-study-02</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>mybatis-study-02</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <spring4.version>4.2.4.RELEASE</spring4.version> </properties> <dependencies> <!-- junit测试包 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <!-- mybatis核心包 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.2.1</version> </dependency> <!-- mybatis整合Ehcache适配器 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-ehcache</artifactId> <version>1.0.0</version> </dependency> <!-- mybatis整合spring适配器 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.0</version> </dependency> <!-- 配置ehcache--> <dependency> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache-core</artifactId> <version>2.6.10</version> </dependency> <!-- 配置spring，使用IOC容器和TX，这些包足够，需要使用其他功能可自行添加，也可将springframework的所有包都添加进去 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.2.4.RELEASE</version> <!--spring-core包依赖commons-logging，本次引用了log4j作为日志实现，所以这里让spring-core依赖于log4j，而不是commons-logging包。至于为什么依赖，这个是spring官网说的，不要纠结这个问题--> <exclusions> <exclusion> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.2.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.2.4.RELEASE</version> </dependency> <!-- 配置springmvc --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.2.4.RELEASE</version> </dependency> <!-- 配置log4j --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.12</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.6</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> <version>1.2</version> </dependency> <!-- mysql连接驱动 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> <!-- 配置数据源 --> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.1</version> </dependency> <!-- servlet --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <!-- <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>3.2.5</version> </dependency> --> <!-- 工具包 --> <!-- <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.1</version> </dependency> --> </dependencies></project>2.mybatis主配置文件
mybatis-config.xml
使用了spring之后，mybatis主配置文件配置较少了。具体存放位置看上图的整个工程架构。
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration> <!-- <properties resource="db.properties"></properties> --> <settings> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> <!-- <mappers> <mapper resource="mapper/system/sysusermapper.xml"/> </mappers> --></configuration>3.mybatis映射配置文件
按照业务区分开。具体存放位置看上图的整个工程架构。
这里只展示一个文件的简单配置：
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="org.mybatis.dao.SysuserMapper"> <!-- 查询方法1，传递一个参数 --> <select id="getEmployeeById" resultType="org.mybatis.bean.Employee"> select * from mybatis_employee where id = #{id} </select> <!-- 查询方法2，传递多个参数 多个参数会被封装成一个map key:param1,param2...paramn或者参数的索引 value:传入的参数值 #{}就是从map中获取指定key的值 --> <!-- <select id="getEmployeeByIdAndLastName" resultType="org.mybatis.crud.Employee"> select * from mybatis_employee where id = #{0} and last_name = #{1} </select> --> <!-- 查询方法2，传递多个参数使用@Param(参数名) 多个参数会被封装成一个map key:@Param指定的值 value:为传递的参数 --> <select id="getEmployeeByIdAndLastName" resultType="org.mybatis.bean.Employee"> select * from mybatis_employee where id = #{id} and last_name = #{lastName} </select> <select id="getEmployeeByEmployeeField" resultType="org.mybatis.bean.Employee"> select * from mybatis_employee where id = #{id} and last_name = #{lastName} </select> <select id="getEmployeeByMap" resultType="org.mybatis.bean.Employee"> select * from mybatis_employee where id = #{id} and last_name = #{lastName} </select> <!-- 插入方法mysql --> <insert id="addEmployee" parameterType="org.mybatis.bean.Employee" useGeneratedKeys="true" keyProperty="id"> insert into mybatis_employee (last_name,email,gender) values (#{lastName},#{email},#{gender}); </insert> <!-- 插入方法oracle --> <insert id="addEmployeeo"> <!-- keyProperty=id需要赋值主键的属性，一般都是id order=before表示在插入之前执行该查询 resultType=Integer表示返回值为integer类型 --> <selectKey keyProperty="id" order="BEFORE" resultType="Integer"> select employees_seq from dual; </selectKey> insert into mybatis_employee (id,last_name,email,gender) values (#{id},#{lastName},#{email},#{gender}); </insert> <!-- 更新方法 --> <update id="updateEmployee"> update mybatis_employee set last_name = #{lastName}, email = #{email}, gender = #{gender} where id = #{id} </update> <!-- 删除方法 --> <delete id="deleteEmployee"> delete from mybatis_employee where id = #{id} </delete></mapper>4.spring配置文件
applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring" xsi:schemaLocation="http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd"> <!-- spring管理所有的业务组件，需要跟springmvc区分 --> <context:component-scan base-package="org.mybatis"> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <!-- spring管理数据源，AOP，事务 --> <!-- 引入数据库外部配置文件 --> <context:property-placeholder location="classpath:db.properties"/> <!-- spring配置数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="jdbcUrl" value="${mysql.url}"></property> <property name="driverClass" value="${mysql.driver}"></property> <property name="user" value="${mysql.username}"></property> <property name="password" value="${mysql.password}"></property> </bean> <!-- spring配置事务管理器 --> <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 配置基于注解的声明式事务 --> <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/> <!-- spring整合mybatis 1.spring管理所有组件，mapper实现类 @Autowired自动注入mapper 2.spring管理事务 org.mybatis.spring.SqlSessionFactoryBean实现了spring的FactoryBean接口 --> <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"></property> <!-- 指定全局配置文件的位置 --> <property name="configLocation" value="classpath:mybatis-config.xml"></property> <!-- 指定mapper文件的位置 --> <property name="mapperLocations" value="classpath:mapper/*/*.xml"></property> </bean> <!-- 扫描所有的mapper接口的实现，自动注入 --> <mybatis-spring:scan base-package="org.mybatis.dao"/> <!-- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="org.mybatis.dao"></property> </bean> --></beans>5.spring-mvc配置文件
spring-mvc.xml
视图解析器没什么好解释的，按照固定格式配置就行了。
包扫描，因为spring-mvc只负责v层的页面控制，所以只扫描所有的controller就足够了。
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd"> <!-- springmvc控制所有的页面跳转，不牵涉业务逻辑 --> <!-- 只扫描控制器 --> <context:component-scan base-package="org.mybatis.controller" use-default-filters="false"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <!-- 配置视图解析器 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/pages/"></property> <property name="suffix" value=".jsp"></property> </bean> <mvc:annotation-driven></mvc:annotation-driven> <mvc:default-servlet-handler/></beans>6.配置web.xml
引入spring和spring-mvc的配置文件，编码过滤
<?xml version="1.1" encoding="UTF-8"?><web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name>Archetype Created Web Application</display-name> <!-- spring监听配置 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- springmvc Servlet --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <!-- 实际上也可以不通过contextConfigLocation来配置springmvc的配置文件，可以使用默认的配置文件 默认的配置文件为：/WEB-INF/<servlet-name>-servlet.xml --> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app>7.创建页面
这里使用欢迎页index.jsp，跳转页面WEB-INF/pages/loginsuccess.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>主页</title></head><body> <h1>Index Page</h1> <!-- 测试 --> <a href="sysuser/login">welcome</a> <br><br></body></html><%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>login</title></head><body>login success</body></html>8.创建controller层
package org.mybatis.controller;import org.mybatis.service.SysuserService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;@Controller@RequestMapping("/sysuser")public class SysUserController { @Autowired private SysuserService sysuserService; @RequestMapping(value="/login",method=RequestMethod.GET) private String sysuserlogin(){ Integer userId = 2; String loginStatus = sysuserService.login(userId); System.out.println(loginStatus); return "loginsuccess"; }}9.创建service层
package org.mybatis.service;public interface SysuserService { public String login(Integer userId);}package org.mybatis.service;import org.mybatis.bean.Employee;import org.mybatis.dao.SysuserMapper;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Service("sysuserService")public class SysuserServiceImpl implements SysuserService{ @Autowired private SysuserMapper sysuserMapper; public String login(Integer userId) { Employee emp = sysuserMapper.getEmployeeById(userId); System.out.println(emp); return "loginsuccess"; }}10.创建mapper接口
package org.mybatis.dao;import java.util.Map;import org.apache.ibatis.annotations.Param;import org.mybatis.bean.Employee;import org.springframework.stereotype.Repository;@Repository("sysuserMapper")public interface SysuserMapper { public Employee getEmployeeById(int id);}11.测试
跳转结果
打印结果
DEBUG - DispatcherServlet with name ‘springmvc’ processing GET request for [/mybatis-study-02/sysuser/login]
DEBUG - Looking up handler method for path /sysuser/login
DEBUG - Returning handler method [private java.lang.String org.mybatis.controller.SysUserController.sysuserlogin()]
DEBUG - Returning cached instance of singleton bean ‘sysUserController’
DEBUG - Last-Modified value for [/mybatis-study-02/sysuser/login] is: -1
DEBUG - Creating a new SqlSession
DEBUG - SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@6edbe1dd] was not registered for synchronization because synchronization is not active
DEBUG - Fetching JDBC Connection from DataSource
DEBUG - trace com.mchange.v2.resourcepool.BasicResourcePool@74e22cc5 [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@7f446405)
DEBUG - JDBC Connection [com.mchange.v2.c3p0.impl.NewProxyConnection@66803b47] will not be managed by Spring
DEBUG - ooo Using Connection [com.mchange.v2.c3p0.impl.NewProxyConnection@66803b47]
DEBUG - ==> Preparing: select * from mybatis_employee where id = ?
DEBUG - ==> Parameters: 2(Integer)
DEBUG - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@6edbe1dd]
DEBUG - Returning JDBC Connection to DataSource
DEBUG - trace com.mchange.v2.resourcepool.BasicResourcePool@74e22cc5 [managed: 3, unused: 2, excluded: 0] (e.g. com.mchange.v2.c3p0.impl.NewPooledConnection@7f446405)
Employee [id=2, lastName=lisi, email=tang_greatman@qq.com, gender=1]
loginsuccess
DEBUG - Invoking afterPropertiesSet() on bean with name ‘loginsuccess’
DEBUG - Rendering view [org.springframework.web.servlet.view.JstlView: name ‘loginsuccess’; URL [/WEB-INF/pages/loginsuccess.jsp]] in DispatcherServlet with name ‘springmvc’
DEBUG - Forwarding to resource [/WEB-INF/pages/loginsuccess.jsp] in InternalResourceView ‘loginsuccess’
DEBUG - Successfully completed request
DEBUG - Returning cached instance of singleton bean ‘sqlSessionFactoryBean’
本文是在前面系列文章的基础之上实现的，如果对mybatis的一些基本使用不会的，建议先参考前面的mybatis详解-(1)到mybatis详解-(22)系列文章。实现都是手把手搭建和测试的。
到此mybatis的使用就介绍完了。
后续还会写一些什么内容呢？敬请期待….
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